I got a 93 7.3 ford truck that has 160,000 miles on it. I have noticed that lately it has not been running all that great. I am going to change the glow plugs because I have had start up in the morning and some white smoke comming out of the exhaust. My other question will a pluged crankcase ventilation filter make my truck run sluggish and smell like oil burning. It just has recently started no I have not changed the IP pump and I have put a new fuel filter. I am also thinking of putting some fuel treatment in my injectors. Any info will be helpfull. One question where do I find the CV filter on my 93 IDI? Last thing has anyone here ever used AMSOIL and does that stuff really work?

 

I recommend opening up your intake and exhaust. Once those are improved upon you will notice a difference. I noticed a big difference by just changing to a high flow muffler. Are you starting in cold weather when it puffs white smoke at startup? I noticed the same thing on every startup, warm or cold in my 1991 F250 w/ 7.3L IDI. I found out that my valve stem seals were going bad. Does it take more than a few cranks to start? I had that problem, it turns out the starter was going bad. Yes, fuel treatment is a very good idea. It will save you alot of headache down the road. I don't know if that helps any but it should be a good start

 

Check the CDR valve.........located behind the intake held on with 2 bolts, be carefull with the rubber down tube when you remove the CDR from it.

Do you know when to service your CDR valve?

All 6.9L and 7.3L diesel engines are equipped with a CDR (Crankcase Depression Regulator) valve. Even the new 7.3L Power Stroke is also equipped with the same valve. The CDR valve is one of the leading causes of head gasket failure in these engines. The CDR valve is responsible for controlling the pressure/vacuum in the engine crankcase, and seperating the oil mist from the air and returning the oil to the crankcase. The CDR valve should be serviced every second oil change or when signs listed below are seen.

When the CDR valve is not properly serviced, engine oil enters the air intake and is drawn into the engine. The diesel engine will burn this oil as fuel, however, it is heavier and thicker than diesel fuel and, having greater BTU output, causes excessive heat in the cylinder. Due to the intake manifold design, most of the oil will migrate to #7 and #8 cylinders; the last two cylinders in the rear by the firewall. The increased temperature here will cause the cylinder head to lift off the gasket and allow water or oil to leak out the back of the cylinder head where it meets the block.

To check your CDR valve, remove the air cleaner hold down bolt and inspect it. If the bolt is covered with engine oil mist, it's time to service your CDR valve! Ford calls this item a "Adapter assembly for Crankcase Ventilation" Part number E3TZ-6A665-A or IH part #1805319C1


To service the CDR wash with a solvent, allow to dry, do not use compressed air to dry. There is a small hole in the CDR back cover, ensure it is clean and open. If black chunks of rubber are visible in the intake, on the screen then the rubber membrane has disintegrated, replace the CDR.

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Remember the cold cylinders will allow white/blue smoke until they fire so a small puff is normal on a start. Starters should turn engine faster than you can count engine revolutions.

 

My 93 F-350 4x4 with about the same mileage had a fair bit of white smoke at start up, and always smoked a bit at idle until I put in a rebuilt set of injectors. With that kind of mileage mine were leaking had poor spray patern etc. When I put in the new injectors all the smoking quit and I gained about 2 mpg.